气象卫星Markov时变信道的建模与仿真

Markov time-varying channel modeling and simulation of meteorological satellite

天气变化的随机过程决定了气象卫星信道的Markov时变特性。根据北京气象卫星地面站上空的云类型统计结果,给出了晴空、多云和阴雨天气时气象卫星信道三种状态的稳态概率分布和信道状态转移矩阵,并提出了气象卫星Markov时变信道仿真模型的建立方法。通过计算机仿真实验对理论模型和仿真模型的包络概率密度分布和误码率曲线进行了对比,两种曲线符合程度较好,说明所建立的仿真模型可以描述气象卫星时变信道的特性。

Markov time-varying characteristics of meteorological satellite channel depends on the process of weather random variation. According to statistical results of cloud types over Beijing meteorological satellite ground station,the steady-state probability distribution and the channel state transition matrix are given which belong to meteorological satellite channel status under skies,cloudy and rainy weather conditions,and the method establishing simulation model of the Markov time-varying channel of meteorological satellite is proposed. The envelope probability density distribution and BER curves of theoretical model are contrasted with simulation model by computer simulation,two kinds curves have a good degree of match, which shows the simulation model can describe the characteristics of meteorological satellite time-varying channel.